I have had this fetish, long before I even knew what it was called, back in the early 90's, when I was married to my first wife, and there was no readily available porn.
I broached the subject with her, and she would reluctantly play along with my fantasy, but I couldn't help but think I was fucked up, and I'm pretty sure that, at the time, she thought I was fucked up too.
Well, on to the second marriage... told her about my fantasy as well... about 5 years in, wanted to "spice things up"... and while we never did it, she indicated a willingness to try it.
Now, I have a hot girlfriend, who's 10 years younger than me. Before we started dating, we were just friends, and I had told her about my desire to watch my spouse/girlfriend get fucked by another man. It really turned her on at the time. Then, a few months later, we started dating, and it has come up again. Funny thing is, though, that we both stated "we need to be in a deep, committed (read: married) relationship, before we try this.
We also started discussing some ground rules. The first being "You don't shit where you eat". Meaning we do this out of town, and not with our friends. I am very much an alpha male in both my public life, as well as my private life, and while I find some aspects of cuckolding appealing, I think I would much rather go the "hotwife" route, and have occasional "flings" in a hotel room in another town/state.
My advice to anyone ? ...
If you're going to enter the lifestyle, I would talk about it. My advice, set up ground rules, gooooooo slooooooooow, and make sure you find out what her desires regarding it will be.
FUCK MY WIFE!
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